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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91d99686100eac756d5e2157ec9d14ce02fce559a6fe5a84d9e4daa07619ab91' 
  AND token = 'HnIlAK+Gex4bGFbK0pRJPcxDl0EQqjQt9oxycfzvcjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}